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Towing a vehicle behind your motorhome means the towed vehicle's own lights typically aren't wired to work with your coach, which is a real visibility problem in traffic. This Hopkins kit solves that by plugging directly into the towed vehicle's existing wiring system, letting its tail lights and turn signals activate along with your motorhome's.
Built-in diodes isolate the two electrical systems from each other, so you get the lighting function without risking a short or feeding power back where it shouldn't go.
It's a clean way to make sure other drivers can read your towed vehicle's signals just as clearly as your motorhome's.